Electric heater



C, E. CLARK AND A G. DOWELL.

ELECTRIC HEATER.

APPLICATION FILED FEB 26. 19m.

1,327,986. Patnted Jan. '13, 1920;

Q0 0 Q 00 0 0 0 00 o o 000 00000000 OO-OO0O- INV ENTO RS Charles E, 01 A fire/ate 6. Powell dziil m ATTORNEYS UNITED STATES PATENT OFFICE.

CHARLES E. CLARK AND ARCHIE G. DOWELL, OF SAN FRANCISCO, CALIFORNIA; SAID DOWELL ASSIGNOR TO SAID CLARK.

ELECTRIC HEATER.

Application filed February 26, 1919.

To all whom itmay concern Be it known that we, CHARLES E. CLARK and ARCHIE G. DowELL, both citizens of the United States, residing at San Francisco, in

Specification of Letters Patent.

This invention relates to an electric heatin device. V a

t is the principal object of this invention to provide an electric heater which is economical in its construction and which may be conveniently used for heating the rooms of dwellingsand like places by electric ty,

designed to prevent direct radlation of e heat from the heating element and to insure that it will be uniformly distributed over a large area surrounding the heating structure, thereby establishing a larger'zone'of heat'radiation than commonly produced by heaters of' the direct; heating or-reflectlng type.

The present invention contemplates the use of a centralcore. upon "which is mounted the heating element: and which element is in closed within a'heat distributing casing, this casing also inclosingheat reflectors adapted to the'electric fintureor the socket carried by the' device, the heatwcasin'g being further more inclosed within protectivecage and allofth'e various elements designed to be readily assembled by a single simple fastenf' in member. I

he invention is illustrated by a of example in. the accompanying drawings, in which the figure indicates a central vertical section through the complete structure, illustrating all of the elementsof the device and to assist in preventing the radiationof heat furthersh'owing one of reflectors-in ele-= vation.

Referring-more particularly t'o'the drawings, 10 indicates a screwplug formed of dielectric material and fitted with a metallic screw and with suitable electrical contacts of common construction.

The lower portion of the plug 10 is enlarged and is provided with yieldable sprin contacts 11'and'12, b "which an vattac ment' member 13 may be etachably sec-manure by. V of dielectric material and carriesa pair of spring fingers 14 and 15 within it. These fingers are adapted to frictionally engage The attachment member 13 is formed casing and making Patented Jan. 13, 1920.

Serial No. 279,267. I

the fingers 11 and 12 previously referred to and will thus hold the plug 10 in engagement wlth the member 13. The spring fingers 14 and 15 are secured in position by sembling bolt 19. The bolt 19 is formed with an enlarged head which hangs within the member 13 and supports the bolt'so that the various elements of the heater may be strung thereon with resultant economical and commercial advantage.

Intermediate the length of the plug 10 is formed an annular groove 20. .This groove I is adapted to provide a seatfor 'a'conical canopy 21.- The conical canopy 21 flares outwardly and downwardly and has an annular clamping flange 22 near its lower edge and therearound. Circumscribin'g this clamping flange is a cage ring 23. The cagering may "be provided with means for clamping it in position andsecurely held thereupon. This ring'forins'the upper part of an outer cage 24, carrying a series" of longitudinally extendin rods 25. The 'rods pass downwardly in para lelrelation to each otherand form a cylindrical cage, the lower end of which is closed by the convergence of the wires into 1 a bottom fastening hub 26'. It will be, un-' f 'derstood that other cagerings "24' maybe placed around the rods in order to give it suitable reinforcementi Small fastening brackets 27 are secured around the inner face of the canopy 21 and also are fastened to the outer and upper edge of a'heat casing "28-. The heat casing 28 is here shown as formed of sheet'metal and as having its entire body perforated, as indicated at 29. It will be understood that other foraminous material might be used as an inclosure' to produce the desired effect. This efl'ect is to prevent the direct radiation of heat and to cause it to be thoroughlydistributed over a larger area than would be normally possible, at the same time thoroughly heating the medium.

The lower end ot the casing 29 is closed by aperforated end cap 30 through which the bolt 19 extends. Positioned upon the upper end of the bolt 19 is an insulating it the radiating tube 31. One end of this tube rests-directly against the lower end of the connecting member 13 and the other end of the tube rests against an inverted conical reflector 32. This reflector is here shown as formed of two-ply sheet metal between which a thickness of heat insulating substance is disposed. Directly beneath the reflector 32 is a heat insulating tube 33 which is also strung on the bolt 19 and this tube bears against the upper inner face of a heat reflector 34, identical with the reflector 32. -An insulating bead 35 is mounted upon the bolt 19 and forms a support for the reflector. The bead 35 is supported upon a metallic spider 36, resting directly upon the cylindrical core 37 of ,a heating element 38. may be formed of any suitable dielectric ma- 'terial such as'soapstone and the like. The

lower end of the core 37 is supported by a spider 39, similar to the upper spider 36.

This spider rests directly upon the end 30 of the heat case. The lower end of the bolt 19 is threaded for considerable distance and carries a fastening nut 40 adapted to bear against the end cap 30 of the heat case and hold all of the elements in rigid relation to each other upon the bolt. The extreme end of the bolt 19 extendsthrough the hub mem-. ber 26 and is therefittedwith a small nut 41 which holds the structure completely in position. It will be noted that the'bolt 19 forms the central member of the heating element and around this bolt all of the parts may be disposed in their proper relation to each other and thereafter. fixed by the positioning of the nuts 40 and 41, as previously described- Due to this arrangement, the 1 problems of assembly will be materially reduced and as the parts of thestructure may be readily and inexpensively made, it will be evident that a very economical heating device will be provided. It will be un derstood that the. heating element is supplied with, electricity by means ofthe lead wires 42 and 43 which extend upwardly through. insulating bushings 44 and are. secured to the screws 16 and 17 carried in the mem- ,ber 13.

In the operation of the device, the heating element will reach its predetermined heat,

which in turn will radiate and will be absorbed and distributedv by the heat casing.

While we have shown the preferred form of our invention, it will be understood that various changes in the combination, con

struction and arrangement of ,parts may be made by those skilled in "the art, without departing from the spirit of the invention,

as claimed.

Having thus described our invention, what -we claim and desire to secure by Letters Patent is 1. A cylindrical vertically suspended heater comprising an electric plug and di- The core 37 vergent surrounding canopy, a dielectric member suspended from the plug, conducting wires extending from the plug through the dielectric mem er, a suspended heating coil with which the wires are connected, and a foraminous cylindrical casing surrounding the heating coil.

2. A vertically suspended heater,comprising an electric plug, a divergent canopy suspended from the plug, a foraminous casing having its upper end fixed to the canopy, a dielectric member extending downwardly from theplug within the casing, conducting wires from the plug, a resistance coil within the casing with which the wires connect. downwardly convergent reflectors above the coil and within the casing, and a central rod having its head suspended within the resistance coil, Wires 'connecting' the plug with the C011,, downwardly convergent re 'flectors above the coil, a rod having its head withiifthe dielectric member, a'foraminous nclosing casing within which the abovenamed members are contained and through which the rodpasses', with meansto su port and adjust the inclosed members, a ownwardly divergent canopy supported from the plug and itself'supporting the casing, and circumscribing parallel rods supported from the canopy with the lower ends curved inwardly and united to a central hub secured to the suspending rod.

5. An electric heater comprising a connecting plug, an asfsembling bolt mounted within the plug, reflecting members strung uponsaid bolt, a heating. element through which the bolt passes, a heat casing inclosng said reflectors and the heating element, and means for tightening the casing, saidreflectors and the element upon the bolt. f

6. An electricv heater comprising a connecting plug, an assembling bolt mounted within the plug, reflecting members strung upon said bolt, a heating element through which thebolt passes, a heat casing inclosing said reflectors and the heating element,

'means for tightening the casing, said reflectors and the element upon the bolt, and a protecting ca e secured i'n'its assembled position by the olt. J

mamas a 7. An electric heater comprising an attachment plug, a surrounding canopv. :1 heating coil suspended from said plug, electrical connections between said coil and plug 5 and an apertured inclosing structure for said coil.

8. An electric heater comprising an attachment'plug, a surrounding canopy, a heating coil suspended from said plug, elec- 10 trical connections {between said coil and plug, an apertured inclosing structure for said coil, and heat reflecting means disposed above said coil and Within said inclosing structure.

In testimony whereof we have hereunto 15 set our hands in the presence of tWo subscribing witnesses.

CHARLES E. CLARK. ARCHIE Gr. DOWELL. VVitnes'ses:

JOHN H. HERRING, \V. WV. HEALEY. 

